<!DOCTYPE html>
<html>
<body>
<style>
  html, body {
    margin: 0;
    padding: 0;
  }
  section, div {
    width: 180px;
    height: 180px;
  }
  section {
    padding: 10px;
    background-color: green;
  }
  div {
    background: linear-gradient(to right, red, yellow);
  }
</style>
<section><div></div></section>
</body>
</html>
